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Other Non-Current Assets - Additional Information (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Long Term Assets [Line Items] |  |
Deposits for conservation and documentation of artifacts | $ 100,000 |
Deposits | 532,500 | $ 532,500
UNITED KINGDOM |  |
Other Long Term Assets [Line Items] |  |
Deposits with United Kingdom's Ministry of Defense | $ 432,500 |

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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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